CN1659380A - Pump unit - Google Patents
Pump unit Download PDFInfo
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- CN1659380A CN1659380A CN038132753A CN03813275A CN1659380A CN 1659380 A CN1659380 A CN 1659380A CN 038132753 A CN038132753 A CN 038132753A CN 03813275 A CN03813275 A CN 03813275A CN 1659380 A CN1659380 A CN 1659380A
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- China
- Prior art keywords
- pump
- pressure
- fixed volume
- volume formula
- pump assembly
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/002—Hydraulic systems to change the pump delivery
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
- F04B49/065—Control using electricity and making use of computers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/08—Regulating by delivery pressure
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/02—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for several machines or pumps connected in series or in parallel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/06—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for stopping, starting, idling or no-load operation
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/08—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the rotational speed
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2270/00—Control; Monitoring or safety arrangements
- F04C2270/56—Number of pump/machine units in operation
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Control Of Positive-Displacement Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
- Eye Examination Apparatus (AREA)
- Control Of Fluid Gearings (AREA)
Abstract
Provided is a pump unit capable of obtaining high discharging pressure by a motor having comparatively small torque, and decreasing noise/vibrations at the time of large flow operation. A first pump (1) made from a gear pump of a small capacity, and a second pump made from a gear pump of a large capacity are directly united by a variable speed motor (3) controlled in the number of revolutions by a control device (4). In a first mode. a discharge line (5) of the first pump is diverted from a discharging line (8) of the second pump, and the first pump is unloaded to carry out constant horsepower operation, thereby making a discharge fluid have high pressure by comparatively small torque. In a second mode, the discharging line (5) of the first pump is merged with the discharging line (8) of the second pump to carry out the constant horsepower operation, thereby discharging the large flow amount of the discharge fluid at a comparatively low number of revolutions. When the number of revolutions of the variable speed motor (3) is lower than a specified value, a switch valve (6) is switched from a merging state to a diverting state. When discharging pressure is lower than a specified value, the switch valve (6) is switched from the diverting state to the merging state.
Description
Technical field
The present invention relates to pump assembly.
Background technique
As existing pump assembly as shown in Figure 4.This pump assembly has the control unit 53 that the frequency of carrying out the fixed volume formula pump 52 of rotating speed variable drive and the electric current by change supplying with described variable speed driver 51 by variable speed driver 51 is controlled the rotating speed of motor 51.This control unit 53 receives the signal from the pressure transducer 54 of the pressure of the discharge way that detects described pump 52, control the rotating speed of described pump 52 by the rotating speed of controlling described variable speed driver 51, the force value that this pressure transducer 54 is detected becomes the value of regulation.
But therefore described pump assembly in the past in order to improve the head pressure of described fixed volume formula pump 52, needs to use the fixed volume formula pump of big torque motor or small capacity owing to be to drive a fixed volume formula pump 52 with variable speed driver 51.If but use the motor of described big torque, then can cause the maximization of pump assembly and the problem that cost increases.And if use the fixed volume formula pump of described small capacity, when carrying out the running of big flow, the rotating speed of pump and motor becomes excessive, therefore has the noise and the excessive problem of vibration of pump assembly.
Summary of the invention
Therefore, the object of the present invention is to provide a kind of motor of less torque that uses just can obtain high head pressure, and the noise can reduce the running of big flow time the, the pump assembly of vibration.
In order to achieve the above object, one of the present invention's pump assembly is characterised in that to have: the jumbo first fixed volume formula pump; The second fixed volume formula pump of small capacity; Drive the variable speed driver of the described first and second fixed volume formula pumps; Make discharge road and the interflow, discharge road of the described second fixed volume formula pump or the switching valve of shunting of the described first fixed volume formula pump; Detect the pressure transducer of the discharge road pressure of the described second fixed volume formula pump; Control gear with the operation mode of controlling described pump assembly, its input is from the signal of described pressure transducer and the signal of the described variable speed driver rotating speed of expression, by controlling described switching valve and variable speed driver, make described pump assembly with discharge road shunting, make the first fixed volume formula pump carry out first mode operation of firm power running with the state that unloads the described first fixed volume formula pump; Or make described pump assembly to carry out second mode operation that firm power turns round under the state that collaborates on the discharge road of the discharge road that makes the described first fixed volume formula pump and the second fixed volume formula pump.
Pump assembly one of according to the present invention, by described control gear, switching valve is switched in first pattern, make the discharge road of the described first fixed volume formula pump constitute the state of shunting with the discharge road of the second fixed volume formula pump, thereby make the described first fixed volume formula pump become the state of unloading.Under this state, described variable speed driver has been received from the described control gear of the signal of the rotating speed of the signal of described pressure transducer and the described variable speed driver of expression and has controlled, and carries out the firm power operation with first pattern.
In this first pattern because the jumbo first fixed volume formula pump becomes the state of unloading, therefore according to output little, be the described second fixed volume formula pump of small-sized variable speed driver and small capacity, can obtain the head pressure of little discharge capacity and high pressure.Thereby, do not need to use in order to improve head pressure as prior art large-scale motor.
And, according to described control gear, switching valve is switched in second pattern, make the discharge road of the fixed volume formula pump of winning become the interflow state on the discharge road of the second fixed volume formula pump, under this state, variable speed driver has been received the described control gear control from the signal of the rotating speed of the signal of described pressure transducer and the described variable speed driver of expression, the running of the line stabilization horsepower of going forward side by side.
In second pattern, because the second fixed volume formula pump of jumbo first fixed volume formula pump and small capacity interflow, therefore the smaller rotating speed with variable speed driver can obtain bigger flow.The vibration of pump assembly and the phenomenon that noise becomes excessive thus, can be as prior art appear because of the rotating speed of variable speed driver and fixed volume formula pump is excessive.
And in described first and second patterns, because variable speed driver stablize horsepower running under the control of described control gear, so head pressure and flow controlled automatically, and do not need from outside reception command signal.Thereby, can omit the input signal cable that is used to instruct, so wiring becomes simply, do not need to import simultaneously the operation of described command signal, so the operation of pump assembly becomes simple.
The present invention's two pump assembly, on the basis of one of the present invention's pump assembly, constitute, it is characterized in that, when described control gear is lower than predefined setting rotating speed at the rotating speed of described variable speed driver, described switching valve is switched to the branch stream mode from the interflow state, and when the pressure that described pressure transducer detects is lower than predefined setting pressure, described switching valve is switched to the interflow state from a minute stream mode.
Two pump assembly according to the present invention, under the situation that described switching valve is switched to the branch stream mode from the interflow state, be based on the rotating speed of variable speed driver, and under the situation that described switching valve is switched to the interflow state from minute stream mode, be based on the detected pressures of pressure transducer, therefore the amplitude of the dead band in the control must increase, thereby can prevent the unstability of described switching valve between interflow state and branch stream mode.Can prevent the pressure of discharge fluid of pump assembly and the fluctuation of flow thus.
And, can stablize the horsepower running according to described control gear, and be switched according to the rotating speed of described motor and the checkout value switching valve of pressure transducer, therefore do not need to receive the command signal from the outside, the control of head pressure and flow and the switching of operation mode are controlled automatically.Thereby, can omit the input signal cable that is used to instruct and make wiring become simple, do not need to import simultaneously the operation of described command signal, so that the operation of pump assembly becomes is simple.
Three pump assembly according to the present invention, be on one of the present invention's basis, to constitute, it is characterized in that, when described control gear is higher than predefined setting rotating speed at the rotating speed of described variable speed driver, described switching valve is switched to the interflow state from a minute stream mode, and when the pressure that described pressure transducer detects is higher than predefined setting pressure, described switching valve is switched to the branch stream mode from the interflow state.
Three pump assembly according to the present invention, it is characterized in that, it under the situation that described switching valve is switched to the interflow state from minute stream mode rotating speed according to variable speed driver, and under the situation that described switching valve is switched to the branch stream mode from the interflow state detected pressures according to pressure transducer, therefore the amplitude of the dead band in the control must become greatly, so can prevent the instability of described switching valve between interflow state and branch stream mode.Thereby, can prevent the pressure of discharge fluid of pump assembly and the fluctuation of flow.
In addition, stablize the horsepower running according to described control gear, and switching valve is switched according to the rotating speed of described motor and the checkout value of pressure transducer, therefore do not need to receive command signal, can control the control of head pressure and flow and the switching of operation mode automatically from the outside.Thus, can omit the input signal cable that is used to instruct and make wiring become simple, not need to import simultaneously the operation of described command signal, so that the operation of pump assembly becomes is simple.
Four pump assembly according to the present invention for one of the present invention to the present invention three in arbitrary pump assembly, it is characterized in that, described control gear has by changing described setting rotating speed of input and setting pressure, described first pattern and second pattern is subdivided into the setting input part of a plurality of patterns respectively.
Four pump assembly according to the present invention, by utilizing the input of described setting input part a plurality of respectively at the setting value of described setting rotating speed and setting pressure, described the 1st pattern and the 2nd pattern can be subdivided into a plurality of patterns respectively, and can suitably corresponding characteristic and the operating condition that the equipment of fluid is provided by pump assembly.
Description of drawings
Fig. 1 is the figure of the pump assembly of expression embodiments of the present invention.
Fig. 2 is the figure that will be shown in according to the pressure-flow property list of calculating from the input information of setting input part 19 on the two-dimensional coordinate.
Fig. 3 A, 3B, 3C, 3D are the figure that illustrates other pressure-flow characteristics.
Fig. 4 is the figure of the pump assembly of expression prior art.
Embodiment
Below, the present invention is described in detail in conjunction with illustrated mode of execution.
Fig. 1 is the figure of the pump assembly of expression embodiments of the present invention.This pump assembly is the pump assembly to the working fluid of not shown fluid pressure drive device supply tank T such as oil hydraulic cylinder.This pump assembly has as first pump 1 of the jumbo first fixed volume formula pump with as second pump 2 that directly is connected small capacity the 2nd fixed volume formula pump on this first pump 1.Described first pump 1 has the gear pump of 5.5cc/rev to constitute, and described second pump 2 is made of the gear pump of 3.5cc/rev.Described first pump 1 and second pump 2 are connected on the variable speed driver 3, and this variable speed driver 3 is electrically connected with control gear 4.The discharge road 5 of described first pump is connected on the switching valve 6, by this switching valve 6, can switch to the discharge road 8 of second pump or lead to the discharge road 11 of fuel tank 10.The flow control valve 9 of the discharge road 8 of described second pump by the band one-way valve is connected with not shown fluid pressure drive device.This throttle valve 13 of discharging the action fluid of road 8 by discharging the regulation leakage rate is connected with discharge road 11, and by being connected with described discharge road 11 with safety valve (relief) that described throttle valve 13 is set up in parallel.And, discharging the pressure transducer 17 that is provided with the head pressure that is used for detecting first and second pumps 1,2 on the road 8.On the other hand, the discharge road 5 of described first pump is connected with discharge road 11 by safety valve 15.Described control gear 4 to 19 inputs of the setting input part that is electrically connected with it for setting from the pressure maximum of discharging the working fluid of discharging on road 8 and peak rate of flow etc.And described control gear 4 is electrically connected with described pressure transducer 17, and is electrically connected with described motor 3, makes it can receive the signal of the rotating speed of the described variable speed driver 3 of expression.
Described control gear 4 has to the frequency variator portion of described variable speed driver 3 output driving currents and is controlled the control device of frequency of the output current of described frequency variator portion by microcomputer being used to of constituting.This control device utilization is calculated the pressure-flow characteristic that described first and second pumps 1,2 should possess in the running by the information of described setting input part 19 inputs.According to described pressure-flow characteristic with from the current force value of described pressure transducer 17 and the current rotating speed of variable speed driver 3, control the rotating speed of variable speed driver 3 by described frequency variator portion, and control the switching state of described switching valve 6.
In the pump assembly of present embodiment, the control device of described control gear 4 forms, and can control described variable speed driver 3 and switching valve 6 with first pattern and second pattern.First pattern is, the discharge road 5 that makes described first pump with discharge road 8 shuntings, make described first pump 1 under the state of (unload) that unloads, stablize horsepower and turn round.That is, only the discharge fluid of second pump 2 is transported in the fluid pressure drive device by discharging road 8.On the other hand, second pattern is, stablize horsepower and turns round under the state with 8 interflow, discharge road of the discharge road 5 of described first pump and second pump.That is, be transported in the fluid pressure drive device by the discharge fluid of discharge road 8 with first and second pump, 1,2 both sides.
Fig. 2 represents the figure of the control device of described control gear 4 according to the value of the pressure-flow characteristic of calculating from the information of described setting input part 19 inputs for being that flow, transverse axis are on the two-dimensional coordinate axle of pressure at the longitudinal axis.As shown in Figure 2, the part of first pattern of this pressure-flow characteristic line forms at switching point CP with the part of second pattern and is connected.First mode section of described pressure-flow characteristic line is the part that only relates to the discharge fluid of second pump 2, is made of pressure maximum line MP1, maximum horsepower curve M HP1 and peak rate of flow line MV1.Second mode section of described pressure-flow characteristic line relates to the part with the discharge fluid at first and second pumps, 1,2 interflow, is to be made of pressure maximum line MP2, maximum horsepower curve M HP2 and peak rate of flow line MV2.
When the pump assembly running with said structure, described control device is drawn the current point that decides according to by described pressure transducer 17 current head pressure that detects and the current discharge flow rate that is equivalent to the rotating speed of variable speed driver 3 in the coordinate of Fig. 2.Calculate the current horsepower of this current point, try to achieve the deviation between the target horsepower on itself and the described pressure-flow characteristic line.In the control signal input converter portion with this deviation of expression, control the rotating speed of described variable speed driver 3, so that current horsepower reaches target horsepower.To remain on the pressure-flow characteristic line shown in Figure 2 from the pressure of the discharge fluid of discharging road 8 and the relation of flow thus.Its result need not be according to instruction or the input from the outside, just can be automatically the output of pump assembly be controlled to be maximum.
And, do not need under the situation of flow keeping very big pressure, control gear 4 is under the state of the little discharge flow rate that makes variable speed driver 3 low speed rotation, pressure is remained on the highest setting pressure Pm, make second pump 2 discharge the small flow of the point on the pressure maximum line MP1 of the longitudinal axis that is roughly parallel to Fig. 2 thus.Thereby therefore the variable speed driver 3 and second pump 2 need can not reduce a horsepower loss, energy saving and reduce noise to exceed necessary rotation speed operation.
On the other hand, do not need under the situation of pressure at the very big flow of needs, control gear 4 rotates variable speed driver 3 by frequency variator portion, so that the head pressure of first and second pumps 1,2 becomes the little pressure of the point on the peak rate of flow straight line MV2 with transverse axis (pressure axis) almost parallel of Fig. 2.Therefore, therefore the variable speed driver 3 and first and second pumps 1,2 need can not reduce a horsepower loss, energy saving and reduce noise to exceed necessary rotation speed operation.
As mentioned above, the pump assembly of present embodiment by carrying out variable speed driver 3 by described control gear 4 rotating speed control and the switching of switching valve 6, just can turn round automatically, and need be according to instruction from the outside.Thereby, the processing ease of this pump assembly.And, do not need to receive from the wiring of the instruction usefulness of outside etc., therefore can reduce the wiring of pump assembly, can make this pump assembly that the place is set is neatly orderly, and can simplify the setting operation of pump assembly.
Here, when having only second pump 2 to discharge the running of fluid, under the situation of head pressure, switch to 4 pairs of described switching valves 6 of control gear that head pressure reduces according to input from described pressure transducer 17 less than Pc.Promptly, apply assigned voltage, drive solenoid valve, make the discharge road 5 of first pump 1 and 8 interflow, discharge road of second pump 2 by electromagnetic coil to described switching valve 6.Then, control gear 4 is by the rotating speed of control variable speed driver 3, and the shaft horsepower of the discharge fluid of first and second pumps 1,2 at interflow is controlled on the maximum horsepower curve M HP2 of Fig. 2.
On the other hand, when discharging the running of fluid, reduce under the situation that is lower than Vc, detect the described switching valve 6 of control gear 4 switchings of the minimizing of its discharge flow rate from the rotating speed of motor in discharge flow rate by first and second pump 1,2.That is, the electromagnetic coil by changing described switching valve 6 apply voltage, the change valve position is shunted the discharge road 5 and the discharge road 8 of second pump 2 of described first pump 1.Then, by the rotating speed of control variable speed driver 3, will be controlled on the maximum horsepower curve M HP1 of Fig. 2 with the shaft horsepower of the discharge fluid of second pump 2 of first pump shunting.
The pump assembly unit of present embodiment, switching to the interflow state from the branch stream mode of described switching valve 6 is to carry out according to the head pressure of discharging road 8, is to carry out according to the discharge flow rate of discharging road 8 and switch to the branch stream mode from the interflow state.Promptly, switch to the interflow state, be to carry out with switch to the branch stream mode from the interflow state according to different detected object mutually from a minute stream mode.Therefore, because the amplitude of the dead band in the control is big, so even the pressure of this detected object and flow increase and decrease near switching reference value, switching valve 6 can frequently not be switched between interflow and shunting yet and become unstable.Its result can prevent to discharge the fluctuation of the flow and the pressure of fluid, and it is stable that the shaft horsepower of pump assembly also can become.
The pump assembly of present embodiment by changing from input values such as the pressure maximum of described setting input part 19 inputs or peak rate of flow, can be controlled according to the pressure-flow characteristic of the figure different with figure shown in Figure 2.Fig. 3 A, 3B, 3C, 3D illustrate the figure that has changed the pressure-flow characteristic that the input value of pressure maximum, peak rate of flow and maximum horsepower obtains by input.In this example, the part of first pattern and the part of second pattern are set the value of maximum horsepower independently of each other, and set independently of each other from described first pattern to the force value of second mode shifts and from second pattern to flow value of first mode shifts etc.Like this, owing to can set a plurality of patterns respectively to described first and second patterns, the characteristic of the corresponding drive cylinder of being supplied with working fluid by pump assembly etc. can suitably be set the pressure-flow characteristic of discharging fluid.Thereby this pump assembly can be supplied with working fluids to a plurality of drive cylinders with different qualities with suitable pressure-flow characteristic, and, a plurality of operating conditions that can corresponding drive cylinder.
In the above-described embodiment, when the rotating speed of variable speed driver 3 is lower than predefined setting rotating speed, switching valve 6 is switched to the branch stream mode from the interflow state, and when the pressure of described pressure transducer 17 detections is lower than predefined setting pressure, described switching valve 6 is switched to the interflow state from a minute stream mode, but also can carry out control in contrast.Promptly, when the rotating speed of described variable speed driver 3 is higher than predefined setting rotating speed, described switching valve 6 is switched to the interflow state from a minute stream mode, and when the pressure of described pressure transducer 17 detections is higher than predefined setting pressure, described switching valve 6 is switched to the branch stream mode from the interflow state.
And in said embodiment, first and second pump 1,2 is made of gear pump, but also can be as the other forms of pump of trochoid pump, wing pump or reciprocating pump etc. beyond the gear pump, so long as quantitative positive displacement pump, any pump can.
In said embodiment, the pressure-flow characteristic line is to be made of peak rate of flow straight line and maximum horsepower curve and maximum pressure straight line, but the simulation maximum horsepower line that also can use oblique line or broken line to constitute replaces the maximum horsepower curve.And described goal pressure-Flow characteristics line also can be optimal arbitrary curve or a broken line in operation.
And, in said embodiment, set the highest setting pressure, maximum setting flow, maximum setting horsepower etc. by described setting input part 19, but also can utilize EEPROM or flash memory that these the highest setting pressures, maximum setting flow, maximum are set horsepower and write after conveying or before the conveying.
And, in said embodiment, tried to achieve the flow of discharging fluid, but also can flowmeter be set for example discharging on the road 8 from the rotating speed of variable speed driver 3, directly detect the flow of discharge fluid.
Claims (4)
1. pump assembly is characterized in that having:
Jumbo the 1st fixed volume formula pump (1);
The 2nd fixed volume formula pump (2) of small capacity;
Drive the variable speed driver (3) of the described first and second fixed volume formula pumps (1,2);
Make the discharge road (5) and the interflow, discharge road (8) of the described second fixed volume formula pump (2) or the switching valve (6) of shunting of the described first fixed volume formula pump (1);
Detect the pressure transducer (17) of discharge road (8) pressure of the described second fixed volume formula pump (2); With
Control the control gear (4) of the operation mode of described pump assembly, its input is from the signal of described pressure transducer (17) and the signal of expression described variable speed driver (3) rotating speed, by controlling described switching valve (6) and variable speed driver (3), make described pump assembly with discharge road (5) shunting, make the first fixed volume formula pump (1) carry out first mode operation of firm power running with the state that unloads the described first fixed volume formula pump (1); Or make described pump assembly to carry out second mode operation that firm power turns round under the state that collaborates on the discharge road (5) that makes the described first fixed volume formula pump (1) and the discharge road (8) of the second fixed volume formula pump (2).
2. pump assembly according to claim 1 is characterized in that,
When described control gear (4) is lower than predefined setting rotating speed at the rotating speed of described variable speed driver (3), described switching valve (6) is switched to the branch stream mode from the interflow state, and when the pressure that described pressure transducer (17) is detected is lower than predefined setting pressure (Pc), described switching valve (6) is switched to the interflow state from a minute stream mode.
3. pump assembly according to claim 1 is characterized in that,
When described control gear (4) is higher than predefined setting rotating speed at the rotating speed of described variable speed driver (3), described switching valve (6) is switched to the interflow state from a minute stream mode, and when the pressure that described pressure transducer (17) is detected is higher than predefined setting pressure, described switching valve (6) is switched to the branch stream mode from the interflow state.
4. pump assembly according to claim 1 is characterized in that,
Described control gear (4) has, and by setting and import described setting rotating speed and setting pressure in variable mode, described first pattern and second pattern is subdivided into the setting input part (19) of a plurality of patterns respectively.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP169554/2002 | 2002-06-11 | ||
| JP2002169554A JP4218261B2 (en) | 2002-06-11 | 2002-06-11 | Pumping unit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1659380A true CN1659380A (en) | 2005-08-24 |
| CN100414103C CN100414103C (en) | 2008-08-27 |
Family
ID=29727737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB038132753A Expired - Lifetime CN100414103C (en) | 2002-06-11 | 2003-06-02 | Pump unit |
Country Status (9)
| Country | Link |
|---|---|
| US (1) | US7399165B2 (en) |
| EP (1) | EP1533525B1 (en) |
| JP (1) | JP4218261B2 (en) |
| KR (1) | KR100615808B1 (en) |
| CN (1) | CN100414103C (en) |
| AT (1) | ATE368804T1 (en) |
| DE (1) | DE60315307T2 (en) |
| TW (1) | TWI224175B (en) |
| WO (1) | WO2003104655A1 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629094A (en) * | 2012-08-24 | 2014-03-12 | 罗伯特·博世有限公司 | Pump device |
| CN104675775A (en) * | 2013-12-03 | 2015-06-03 | 北汽福田汽车股份有限公司 | Pump truck hydraulic system and pump truck |
Families Citing this family (22)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8337166B2 (en) * | 2001-11-26 | 2012-12-25 | Shurflo, Llc | Pump and pump control circuit apparatus and method |
| SE529328C2 (en) * | 2005-11-15 | 2007-07-10 | Johan Stenberg | Control system and method for controlling electromagnetically driven pumps |
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-
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-
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- 2003-06-02 AT AT03730748T patent/ATE368804T1/en not_active IP Right Cessation
- 2003-06-02 KR KR1020047019967A patent/KR100615808B1/en active IP Right Grant
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- 2003-06-02 US US10/516,912 patent/US7399165B2/en not_active Expired - Lifetime
- 2003-06-02 DE DE60315307T patent/DE60315307T2/en not_active Expired - Lifetime
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103629094A (en) * | 2012-08-24 | 2014-03-12 | 罗伯特·博世有限公司 | Pump device |
| CN104675775A (en) * | 2013-12-03 | 2015-06-03 | 北汽福田汽车股份有限公司 | Pump truck hydraulic system and pump truck |
| CN104675775B (en) * | 2013-12-03 | 2017-08-04 | 北汽福田汽车股份有限公司 | A kind of pump truck hydraulic system and pump truck |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1533525A1 (en) | 2005-05-25 |
| DE60315307D1 (en) | 2007-09-13 |
| JP4218261B2 (en) | 2009-02-04 |
| US20050180855A1 (en) | 2005-08-18 |
| ATE368804T1 (en) | 2007-08-15 |
| JP2004011597A (en) | 2004-01-15 |
| US7399165B2 (en) | 2008-07-15 |
| KR100615808B1 (en) | 2006-08-25 |
| DE60315307T2 (en) | 2007-12-20 |
| KR20050008807A (en) | 2005-01-21 |
| WO2003104655A1 (en) | 2003-12-18 |
| TW200407503A (en) | 2004-05-16 |
| EP1533525A4 (en) | 2005-09-14 |
| EP1533525B1 (en) | 2007-08-01 |
| CN100414103C (en) | 2008-08-27 |
| TWI224175B (en) | 2004-11-21 |
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